Hearing aid



FIG. 1 is an underneath perspective view of a hearing aid;

FIG. 2 is a left side elevated view of the hearing aid;

FIG. 3 is a right side elevation view of the hearing aid;

FIG. 4 is a front elevation view of the hearing aid;

FIG. 5 is a rear elevated view of the hearing aid;

FIG. 6 is a top perspective view of the hearing aid; and,

FIG. 7 is an underneath perspective view of the hearing aid.

The broken lines in the drawings are included for the purpose of illustrating portions of the hearing aid that form no part of the claimed design. 

The ornamental design for a hearing aid, as shown and described. 